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functional_consumer_group_test.go
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functional_consumer_group_test.go
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//+build functional
package sarama
import (
"context"
"fmt"
"log"
"reflect"
"sync"
"sync/atomic"
"testing"
"time"
)
func TestFuncConsumerGroupPartitioning(t *testing.T) {
checkKafkaVersion(t, "0.10.2")
setupFunctionalTest(t)
defer teardownFunctionalTest(t)
groupID := testFuncConsumerGroupID(t)
// start M1
m1 := runTestFuncConsumerGroupMember(t, groupID, "M1", 0, nil)
defer m1.Stop()
m1.WaitForState(2)
m1.WaitForClaims(map[string]int{"test.4": 4})
m1.WaitForHandlers(4)
// start M2
m2 := runTestFuncConsumerGroupMember(t, groupID, "M2", 0, nil, "test.1", "test.4")
defer m2.Stop()
m2.WaitForState(2)
// assert that claims are shared among both members
m1.WaitForClaims(map[string]int{"test.4": 2})
m1.WaitForHandlers(2)
m2.WaitForClaims(map[string]int{"test.1": 1, "test.4": 2})
m2.WaitForHandlers(3)
// shutdown M1, wait for M2 to take over
m1.AssertCleanShutdown()
m2.WaitForClaims(map[string]int{"test.1": 1, "test.4": 4})
m2.WaitForHandlers(5)
// shutdown M2
m2.AssertCleanShutdown()
}
func TestFuncConsumerGroupExcessConsumers(t *testing.T) {
checkKafkaVersion(t, "0.10.2")
setupFunctionalTest(t)
defer teardownFunctionalTest(t)
groupID := testFuncConsumerGroupID(t)
// start members
m1 := runTestFuncConsumerGroupMember(t, groupID, "M1", 0, nil)
defer m1.Stop()
m2 := runTestFuncConsumerGroupMember(t, groupID, "M2", 0, nil)
defer m2.Stop()
m3 := runTestFuncConsumerGroupMember(t, groupID, "M3", 0, nil)
defer m3.Stop()
m4 := runTestFuncConsumerGroupMember(t, groupID, "M4", 0, nil)
defer m4.Stop()
m1.WaitForClaims(map[string]int{"test.4": 1})
m2.WaitForClaims(map[string]int{"test.4": 1})
m3.WaitForClaims(map[string]int{"test.4": 1})
m4.WaitForClaims(map[string]int{"test.4": 1})
// start M5
m5 := runTestFuncConsumerGroupMember(t, groupID, "M5", 0, nil)
defer m5.Stop()
m5.WaitForState(1)
m5.AssertNoErrs()
// assert that claims are shared among both members
m4.AssertCleanShutdown()
m5.WaitForState(2)
m5.WaitForClaims(map[string]int{"test.4": 1})
// shutdown everything
m1.AssertCleanShutdown()
m2.AssertCleanShutdown()
m3.AssertCleanShutdown()
m5.AssertCleanShutdown()
}
func TestFuncConsumerGroupFuzzy(t *testing.T) {
checkKafkaVersion(t, "0.10.2")
setupFunctionalTest(t)
defer teardownFunctionalTest(t)
if err := testFuncConsumerGroupFuzzySeed("test.4"); err != nil {
t.Fatal(err)
}
groupID := testFuncConsumerGroupID(t)
sink := &testFuncConsumerGroupSink{msgs: make(chan testFuncConsumerGroupMessage, 20000)}
waitForMessages := func(t *testing.T, n int) {
t.Helper()
for i := 0; i < 600; i++ {
if sink.Len() >= n {
break
}
time.Sleep(100 * time.Millisecond)
}
if sz := sink.Len(); sz < n {
log.Fatalf("expected to consume %d messages, but consumed %d", n, sz)
}
}
defer runTestFuncConsumerGroupMember(t, groupID, "M1", 1500, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M2", 3000, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M3", 1500, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M4", 200, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M5", 100, sink).Stop()
waitForMessages(t, 3000)
defer runTestFuncConsumerGroupMember(t, groupID, "M6", 300, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M7", 400, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M8", 500, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M9", 2000, sink).Stop()
waitForMessages(t, 8000)
defer runTestFuncConsumerGroupMember(t, groupID, "M10", 1000, sink).Stop()
waitForMessages(t, 10000)
defer runTestFuncConsumerGroupMember(t, groupID, "M11", 1000, sink).Stop()
defer runTestFuncConsumerGroupMember(t, groupID, "M12", 2500, sink).Stop()
waitForMessages(t, 12000)
defer runTestFuncConsumerGroupMember(t, groupID, "M13", 1000, sink).Stop()
waitForMessages(t, 15000)
if umap := sink.Close(); len(umap) != 15000 {
dupes := make(map[string][]string)
for k, v := range umap {
if len(v) > 1 {
dupes[k] = v
}
}
t.Fatalf("expected %d unique messages to be consumed but got %d, including %d duplicates:\n%v", 15000, len(umap), len(dupes), dupes)
}
}
// --------------------------------------------------------------------
func testFuncConsumerGroupID(t *testing.T) string {
return fmt.Sprintf("sarama.%s%d", t.Name(), time.Now().UnixNano())
}
func testFuncConsumerGroupFuzzySeed(topic string) error {
client, err := NewClient(FunctionalTestEnv.KafkaBrokerAddrs, nil)
if err != nil {
return err
}
defer func() { _ = client.Close() }()
total := int64(0)
for pn := int32(0); pn < 4; pn++ {
newest, err := client.GetOffset(topic, pn, OffsetNewest)
if err != nil {
return err
}
oldest, err := client.GetOffset(topic, pn, OffsetOldest)
if err != nil {
return err
}
total = total + newest - oldest
}
if total >= 21000 {
return nil
}
producer, err := NewAsyncProducerFromClient(client)
if err != nil {
return err
}
for i := total; i < 21000; i++ {
producer.Input() <- &ProducerMessage{Topic: topic, Value: ByteEncoder([]byte("testdata"))}
}
return producer.Close()
}
type testFuncConsumerGroupMessage struct {
ClientID string
*ConsumerMessage
}
type testFuncConsumerGroupSink struct {
msgs chan testFuncConsumerGroupMessage
count int32
}
func (s *testFuncConsumerGroupSink) Len() int {
if s == nil {
return -1
}
return int(atomic.LoadInt32(&s.count))
}
func (s *testFuncConsumerGroupSink) Push(clientID string, m *ConsumerMessage) {
if s != nil {
s.msgs <- testFuncConsumerGroupMessage{ClientID: clientID, ConsumerMessage: m}
atomic.AddInt32(&s.count, 1)
}
}
func (s *testFuncConsumerGroupSink) Close() map[string][]string {
close(s.msgs)
res := make(map[string][]string)
for msg := range s.msgs {
key := fmt.Sprintf("%s-%d:%d", msg.Topic, msg.Partition, msg.Offset)
res[key] = append(res[key], msg.ClientID)
}
return res
}
type testFuncConsumerGroupMember struct {
ConsumerGroup
clientID string
claims map[string]int
state int32
handlers int32
errs []error
maxMessages int32
isCapped bool
sink *testFuncConsumerGroupSink
t *testing.T
mu sync.RWMutex
}
func runTestFuncConsumerGroupMember(t *testing.T, groupID, clientID string, maxMessages int32, sink *testFuncConsumerGroupSink, topics ...string) *testFuncConsumerGroupMember {
t.Helper()
config := NewConfig()
config.ClientID = clientID
config.Version = V0_10_2_0
config.Consumer.Return.Errors = true
config.Consumer.Offsets.Initial = OffsetOldest
config.Consumer.Group.Rebalance.Timeout = 10 * time.Second
group, err := NewConsumerGroup(FunctionalTestEnv.KafkaBrokerAddrs, groupID, config)
if err != nil {
t.Fatal(err)
return nil
}
if len(topics) == 0 {
topics = []string{"test.4"}
}
member := &testFuncConsumerGroupMember{
ConsumerGroup: group,
clientID: clientID,
claims: make(map[string]int),
maxMessages: maxMessages,
isCapped: maxMessages != 0,
sink: sink,
t: t,
}
go member.loop(topics)
return member
}
func (m *testFuncConsumerGroupMember) AssertCleanShutdown() {
m.t.Helper()
if err := m.Close(); err != nil {
m.t.Fatalf("unexpected error on Close(): %v", err)
}
m.WaitForState(4)
m.WaitForHandlers(0)
m.AssertNoErrs()
}
func (m *testFuncConsumerGroupMember) AssertNoErrs() {
m.t.Helper()
var errs []error
m.mu.RLock()
errs = append(errs, m.errs...)
m.mu.RUnlock()
if len(errs) != 0 {
m.t.Fatalf("unexpected consumer errors: %v", errs)
}
}
func (m *testFuncConsumerGroupMember) WaitForState(expected int32) {
m.t.Helper()
m.waitFor("state", expected, func() (interface{}, error) {
return atomic.LoadInt32(&m.state), nil
})
}
func (m *testFuncConsumerGroupMember) WaitForHandlers(expected int) {
m.t.Helper()
m.waitFor("handlers", expected, func() (interface{}, error) {
return int(atomic.LoadInt32(&m.handlers)), nil
})
}
func (m *testFuncConsumerGroupMember) WaitForClaims(expected map[string]int) {
m.t.Helper()
m.waitFor("claims", expected, func() (interface{}, error) {
m.mu.RLock()
claims := m.claims
m.mu.RUnlock()
return claims, nil
})
}
func (m *testFuncConsumerGroupMember) Stop() { _ = m.Close() }
func (m *testFuncConsumerGroupMember) Setup(s ConsumerGroupSession) error {
// store claims
claims := make(map[string]int)
for topic, partitions := range s.Claims() {
claims[topic] = len(partitions)
}
m.mu.Lock()
m.claims = claims
m.mu.Unlock()
// enter post-setup state
atomic.StoreInt32(&m.state, 2)
return nil
}
func (m *testFuncConsumerGroupMember) Cleanup(s ConsumerGroupSession) error {
// enter post-cleanup state
atomic.StoreInt32(&m.state, 3)
return nil
}
func (m *testFuncConsumerGroupMember) ConsumeClaim(s ConsumerGroupSession, c ConsumerGroupClaim) error {
atomic.AddInt32(&m.handlers, 1)
defer atomic.AddInt32(&m.handlers, -1)
for msg := range c.Messages() {
if n := atomic.AddInt32(&m.maxMessages, -1); m.isCapped && n < 0 {
break
}
s.MarkMessage(msg, "")
m.sink.Push(m.clientID, msg)
}
return nil
}
func (m *testFuncConsumerGroupMember) waitFor(kind string, expected interface{}, factory func() (interface{}, error)) {
m.t.Helper()
deadline := time.NewTimer(60 * time.Second)
defer deadline.Stop()
ticker := time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
var actual interface{}
for {
var err error
if actual, err = factory(); err != nil {
m.t.Errorf("failed retrieve value, expected %s %#v but received error %v", kind, expected, err)
}
if reflect.DeepEqual(expected, actual) {
return
}
select {
case <-deadline.C:
m.t.Fatalf("ttl exceeded, expected %s %#v but got %#v", kind, expected, actual)
return
case <-ticker.C:
}
}
}
func (m *testFuncConsumerGroupMember) loop(topics []string) {
defer atomic.StoreInt32(&m.state, 4)
go func() {
for err := range m.Errors() {
_ = m.Close()
m.mu.Lock()
m.errs = append(m.errs, err)
m.mu.Unlock()
}
}()
ctx := context.Background()
for {
// set state to pre-consume
atomic.StoreInt32(&m.state, 1)
if err := m.Consume(ctx, topics, m); err == ErrClosedConsumerGroup {
return
} else if err != nil {
m.mu.Lock()
m.errs = append(m.errs, err)
m.mu.Unlock()
return
}
// return if capped
if n := atomic.LoadInt32(&m.maxMessages); m.isCapped && n < 0 {
return
}
}
}